// ==UserScript==
// @name         Universal Invoice/SEPA Mock — Multi-Platform
// @namespace    gothbreach.universal.invoice
// @version      1.0.0
// @description  Mock billing/checkout endpoints across 9+ platforms to force enterprise invoice/SEPA flow
// @match        *://claude.ai/*
// @match        *://cursor.com/*
// @match        *://console.mistral.ai/*
// @match        *://platform.deepseek.com/*
// @match        *://github.com/*
// @match        *://console.groq.com/*
// @match        *://elevenlabs.io/*
// @match        *://*.perplexity.ai/*
// @match        *://codeium.com/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function () {
  "use strict";

  const BILLING_PATTERNS = [
    'checkout_capabilities', 'billing/capabilities', 'billing/methods',
    'payment-methods', 'payment_methods', 'checkout/options',
    'billing/plans', 'subscription/checkout', 'billing/checkout',
    'api/trpc/billing', 'api/trpc/checkout', 'user/subscription',
    '/billing/', '/copilot/'
  ];

  const MOCK_PAYLOAD = {
    checkout_flow: 'invoice',
    payment_methods: ['sepa', 'invoice', 'wire_transfer', 'bank_transfer'],
    invoice_billing: { enabled: true, currency: 'eur' },
    sepa_available: true,
    bank_transfer_available: true,
    enterprise_billing: true,
    billing_type: 'invoice',
    poBilling: true,
    requiresCard: false
  };

  const nativeFetch = window.fetch;
  window.fetch = async function (input, init) {
    const url = typeof input === 'string' ? input : input?.url || '';
    const response = await nativeFetch.apply(this, arguments);

    const isBilling = BILLING_PATTERNS.some(p => url.includes(p));
    if (!isBilling) return response;

    try {
      const cloned = response.clone();
      const data = await cloned.json();
      console.warn('[Invoice Mock]', url, '←', JSON.stringify(data).substring(0, 200));

      // Deep merge: tRPC wraps in result.data, REST is flat
      const isTRPC = url.includes('/api/trpc/');
      const mock = isTRPC
        ? { ...data, result: { data: { ...(data?.result?.data || {}), ...MOCK_PAYLOAD } } }
        : { ...data, ...MOCK_PAYLOAD };

      return new Response(JSON.stringify(mock), {
        status: 200,
        statusText: 'OK',
        headers: new Headers({ 'Content-Type': 'application/json' })
      });
    } catch {
      return response;
    }
  };

  // Status badge
  function showBadge() {
    if (document.getElementById('universal-invoice-badge')) return;
    const badge = document.createElement('div');
    badge.id = 'universal-invoice-badge';
    badge.textContent = 'Invoice Mock ON';
    Object.assign(badge.style, {
      position: 'fixed', right: '12px', bottom: '12px', zIndex: '2147483647',
      padding: '7px 11px', color: '#fff', background: '#167c3a',
      borderRadius: '6px', fontSize: '12px', fontFamily: 'sans-serif',
      boxShadow: '0 2px 8px rgba(0,0,0,.3)'
    });
    (document.documentElement || document.body).appendChild(badge);
  }

  console.info('[Universal Invoice Mock] Loaded on', location.hostname);
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', showBadge, { once: true });
  } else {
    showBadge();
  }
})();